JPH09199815A - Microwave circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to adjust the inductance of the circuit element of a microwave circuit. SOLUTION: This microwave circuit is provided with a substrate 10 made of an insulator or a dielectric, and a conductive board member 12 which is formed on the substrate 10, and a required circuit element is obtained utilizing the inductance of the board member 12. In this case, both ends of a conductive wire material 13 are connected to two points 12a and 12b of the board member 12. The inductance of the board member 12 is lowered and adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave circuit, and more particularly to a technique for adjusting circuit characteristics due to manufacturing error or the like. Generally, distributed constant circuit elements used in microwave circuits are configured with a strip line as the basic structure, but there are not many errors in line length and line width due to manufacturing variations, etc., and simple and effective adjustment of circuit characteristics is possible. Technology is required.

[0002]

2. Description of the Related Art FIG. 12 is a schematic diagram of a strip line to which a conventional adjustment technique is applied. In FIG. 12, 1 is a dielectric substrate, 2 is a ground electrode covering one surface of the dielectric substrate 1,
Reference numeral 3 is a strip line formed on the other surface of the dielectric substrate 1. The strip line 3 is a distributed constant line and is used for wiring between elements such as a transistor or for a passive element such as a filter, a directional coupler or a matching circuit.

Here, on the other surface of the dielectric substrate 1, a plurality of metal thin films called lands (hereinafter referred to as "lands").
4a and ab are formed. When an arbitrary land (for example, the land 4b) and the strip line 3 are connected by the wire 5, the capacitance between the land 4b and the ground electrode 2 is added to the strip line 3. Therefore,
The capacitance of the strip line 3 can be increased and adjusted according to the number of connected lands.

[0004] Figure 13 is an equivalent circuit of FIG. 12, L ₁
~ L ₃ is the inductance of the strip line 3, C ₁ ~ C
₄ is the capacitance of the strip line, C _x is the land 4
It is the capacitance of b. Note that L _x is the inductance of the wire 5.

[0005]

However, such a conventional adjustment technique has a disadvantage that the inductance cannot be adjusted, and is insufficient in terms of more effectively adjusting the circuit characteristics.

[0006]

Therefore, the present invention comprises a substrate made of an insulating material or a dielectric material, and a conductive plate member formed on the substrate, in order to adjust the inductance. In a microwave circuit for realizing a required circuit element by utilizing the inductance of a plate member, both ends of a conductive wire material are connected to two spaced points of the plate member.

According to this, the inductance of the plate member is reduced and adjusted by the inductance of the wire.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are diagrams showing an embodiment of a microwave circuit according to the present invention. In FIG. 1, 10 is a dielectric substrate (substrate), 11 is a ground electrode that covers one surface of the dielectric substrate 10, and 12 is a conductive strip line (plate member) formed on the other surface of the dielectric substrate 10. , 13 are wire rods (for example, gold wires) having the same conductivity.

Both ends 13a, 13b of the wire 13 are electrically connected to two points 12a, 12b spaced apart from each other on the surface of the strip line 10, and a distance D between the two points 12a, 12b.
Is at least longer than the length between both ends 13 a and 13 b of the wire 13. Figure 2 is an equivalent circuit of FIG. 1, C ₁₁ ~
C ₁₄ is the capacitance of the strip line 12, L _{11 to} L
₁₂ is the inductance of the strip line 12, and L _y is the inductance of the wire 13. In addition, strip line 1
The resistance of 2 and wire 13 is ignored. Two nodes N ₁ and N ₂ connected to L _y are connected to the strip line 12
The two points 12a and 12b are spaced apart from each other.

The combined inductance between the nodes N ₁ and N ₂ is given by the parallel value of L ₁₁ + L ₁₂ + L ₁₃ and L _y, and the parallel value is these two values (L ₁₁ + L ₁₂ + L ₁₃ and L _y). Since it becomes smaller than the minimum value of (1), the inductance of the strip line 12 can be adjusted to the decreasing side by connecting the wire rod 13. The degree of decrease in the inductance is finely adjusted by changing the length of the wire 13 (correctly, the length between both ends 13a and 13b), the positions of the two points 12a and 12b, or the distance D between the two points 12a and 12b. it can.

Therefore, according to the present embodiment, since the inductance of the strip line 12 can be adjusted, for example, when used in combination with the prior art at the beginning, both capacitance and inductance can be adjusted, which is even more effective. In addition, it is possible to provide a useful technique capable of adjusting the manufacturing error of the microwave circuit. Although one wire is used in the above embodiment, a plurality of wires may be used. FIG. 3 is an example using three wires 14 to 16. The same components as those in FIG. 1 are designated by the same reference numerals.

FIG. 4 shows that the dielectric constant of the dielectric substrate 10 is 9.
8, the thickness is 0.38 mm, the width of the strip line 12 is 0.38 mm, the length is 10 mm, the material is a gold thin film,
Furthermore, each length of the wire rods 14 to 16 is 15 mm,
6 is a transmission chart (so-called Smith chart) when the material is gold wire and the characteristic impedance Z _o of the strip line 12 is 50Ω. The circle tangent to Q indicates the impedance normalized by Z _o , the arc on the right side of the straight line QP indicates inductive, and the arc on the left side indicates capacitive.

The impedance when the wires 14 to 16 are removed from the configuration of FIG. 3 is located at the point a between the straight lines Q and P corresponding to Z _o , and the position does not change even if the frequency changes. On the other hand, when the wires 14 to 16 are connected,
It was confirmed that the impedance behaved as if it moved between points a and b along the broken line c as the frequency changed.
The point eh is in the area to the left of the straight line QP (ie the capacitive area). This is nothing but the reduction of the inductance due to the connection of the wires 14 to 16.

Although the above embodiments are applied to the strip line having a simple shape, the present invention is not limited to this. In short,
It suffices as long as it includes a conductive strip line formed on a dielectric substrate and can realize a required circuit element by utilizing at least the inductance of the strip line. For example, as shown in FIG. Of a stripline 21 having a stub 20 for terminal grounding (short circuit),
N pieces (n is 1, 2, 3, ...) Of wire rods 22, 23 may be connected to the stub 20, and as shown in FIG. You may connect the n wire materials 26 and 27 to the stub 24.

Alternatively, as shown in FIG. 7, a required portion of the strip line 30 (a wide portion 28 in the figure) having a plurality of portions 28 and 29 having stepwise different widths and functioning as an impedance converter. ), N wire rods 31 to 33 may be connected along the longitudinal direction of the line, and as shown in FIG. 8, in the impedance converter, the direction of the n wire rods 34 and 35 is changed to the line wires. You may make it orthogonal to the longitudinal direction of.

Alternatively, as shown in FIG. 9, in the case of a strip line 38 having bent portions (vents) 36 and 37, n pieces of wire rods 39 and 40 are connected to the strip line 38 across the exposed surface of the substrate. You may. Alternatively, as shown in FIG. 10, a strip line 41 functioning as a capacitor
In this case, n wires 42 to 45 may be connected on the line.

Alternatively, as shown in FIG. 11, in the case of a strip line 46 having a complicated shape, a sub strip line 47 is provided at an appropriate position, and two lines are provided between the sub strip line 47 and the strip line 46. You may connect with the wire materials 48 and 49. In this case, the total inductance of the wires 48, 49 and the sub strip line 47 adjusts the inductance of the strip line 46.

In each of the above embodiments, the strip line is a parallel two-conductor line having at least one thin strip conductor, and a low-loss dielectric substrate is generally sandwiched between the strip conductor and the ground conductor. It has a dull structure, and is classified into a microstrip line structure and a shielded strip line structure, etc., depending on the way conductors are arranged.
However, the scope of the present invention is not limited to this. The point is that a substrate including an insulating material or a dielectric material and a conductive plate member formed on the substrate are provided, and a desired circuit element is realized by using at least the inductance of the plate member. However, it is also applicable to, for example, one without a ground conductor.

[0019]

According to the present invention, an extremely advantageous effect that the inductance of the circuit element of the microwave circuit can be reduced and adjusted, which is not available in the prior art, can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram of one embodiment.

FIG. 2 is an equivalent circuit diagram of FIG.

FIG. 3 is another configuration diagram of one embodiment.

FIG. 4 is a transmission diagram of FIG.

FIG. 5 is a diagram (1) showing an application example of the present invention.

FIG. 6 is a diagram (No. 2) showing an application example of the present invention.

FIG. 7 is a diagram (No. 3) showing an application example of the present invention.

FIG. 8 is a diagram (No. 4) showing an application example of the present invention.

FIG. 9 is a diagram (No. 5) showing an application example of the present invention.

FIG. 10 is a diagram (No. 6) showing an application example of the present invention.

FIG. 11 is a diagram (No. 7) showing an application example of the present invention.

FIG. 12 is a configuration diagram of a conventional example.

13 is an equivalent circuit diagram of FIG.

[Explanation of symbols]

 10: Dielectric substrate (substrate) 12: Strip line (plate member) 12a, 12b: 2 points 13: Wire rod

Claims (1)

[Claims] 1. A micro device comprising a substrate made of an insulating material or a dielectric material, and a conductive plate member formed on the substrate, wherein at least the inductance of the plate member is used to realize a desired circuit element. In the wave circuit, two ends of a conductive wire material are connected to two spaced apart points of the plate member, respectively.